The Global Truss Stsb-005 Support Bar/Truss Adapter Allows You To Support A Truss With The St-90, St-132 And The St-157 Crank Stands. It Has A 40mm Diameter And 18" Wide Secure Latches That Are Adjustable From 4.5" To 16".For St-90, St-132, & St-157 Crank Stands18" Wide Secure Latches That Are Adjustable From 4.5" To 16".